SYSE.30:1 - Problem frame

Use this pattern when two builds of “the same source” produce unexplained differences, a package cannot be rebuilt after a worker disappears, or nobody can recover which inputs produced a tested artifact. Start with one required output and one actual build attempt. Recover its source, resolved dependencies, instructions, toolchain and environment before interpreting a source label as a complete build identity.

The result is a repeatable build procedure and an input/output account, or a precise uncontrolled input that prevents that result. In Software Platform Engineering this makes later test and artifact claims refer to recoverable bytes. It does not prove that those bytes behave correctly or came from a trustworthy builder.

If the needed artifact already exists and the task is to transfer that exact artifact, use SYSE.32. If separately developed changes still need integration into a checked mainline, use the direct CI source route in SYSE.31; reproducible isolated branches are not an integrated application.